Which Dragon would win?

Which dragon would win? He couldn't tell and was afraid to watch them fight,
which made him afraid to sit. Could the teacher please give him some advice?
The teacher smiled. He looked at his student, his eyes filled with compassion. "Do
you want to know which dragon will win?" The young monk nodded. "Why the one filled
with love and compassion and wisdom, of course." But how did he know, asked the
young monk. "Because that's the one you'll feed."

This is the more complete story:

This I found online and this is the information I got and quoted have quoted from here.
From: Feeding Dragons
Byron C. Bangert
February 1 2009
First Presbyterian Church Martinsville, Indiana

In his book, STUMBLING TOWARD ENLIGHTENMENT, Geri Larkin, a Buddhist priest, tells
the following story:
There once was a young monk who went to his teacher in tears. He blurted out that he
was having a terrible experience with his meditation practice. Every time he settled down,
took a deep breath, and closed his eyes, all he could see were two dragons fighting each
other. One dragon was a deep blue and it was filled with anger and greed and lust. Even
its fire was terrifying. It was ferocious, this dragon. The other dragon was just as
ferocious. Only the other dragon, pale white, was filled with love, wisdom, and
compassion. Its fire was a deep, deep yellow. The young man was terrified of what would
happen. Which dragon would win? He couldn't tell and was afraid to watch them fight,
which made him afraid to sit. Could the teacher please give him some advice?
The teacher smiled. He looked at his student, his eyes filled with compassion. "Do
you want to know which dragon will win?" The young monk nodded. "Why the one filled
with love and compassion and wisdom, of course." But how did he know, asked the
young monk. "Because that's the one you'll feed." [Celestial Arts, 1997]
The dragon that will win is the one that you will feed!